Install gobjc++-8 by entering the following commands in the terminal:
sudo apt update sudo apt install gobjc++-8
Description:
GNU Objective-C++ compiler
This is the GNU Objective-C++ compiler, which compiles Objective-C++ on platforms supported by the gcc compiler. It uses the gcc backend to generate optimized code.
Homepage: http://gcc.gnu.org/
Version: 8-20180414-1ubuntu2
Section: universe/devel